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          <h1 id="render-topology">Render Topology</h1>

<p>Read <a href="../Topo/index.html">Kinematic Topology</a> <a href="../../rendering/index.html">Rendering</a> for the prerequisite.</p>
<p>A <a class="xref" href="../../../../../api/Hi.Mech.Topo.Asmb.html">Asmb</a> is a group to render its descendent <a class="xref" href="../../../../../api/Hi.Mech.Topo.Anchor.html">Anchor</a>s.</p>
<p>Several ways to render with the topology:</p>
<ul>
<li>Render by Anchoring Matrix Map</li>
<li>Render by Anchored Displayee</li>
</ul>
<h2 id="render-by-anchoring-matrix-map">Render by Anchoring Matrix Map</h2>
<h2 id="render-by-anchored-displayee">Render by Anchored Displayee</h2>
<p>Inherit <a class="xref" href="../../../../../api/Hi.Mech.Topo.IAnchoredDisplayee.html">IAnchoredDisplayee</a> or apply <a class="xref" href="../../../../../api/Hi.Mech.Topo.AnchoredDisplayee.html">AnchoredDisplayee</a> to <a class="xref" href="../../../../../api/Hi.Mech.Topo.Asmb.html">Asmb</a>.Display().</p>
<p>Inherit <a class="xref" href="../../../../../api/Hi.Mech.Topo.ITopoDisplayee.html">ITopoDisplayee</a> to manage the object with <a class="xref" href="../../../../../api/Hi.Mech.Topo.Asmb.html">Asmb</a> and plural anchors .</p>
<p>The base logic is also by the anchoring matrix. Here is some class and function wrapping the logic.</p>
<p>The sample code shows the topology rendering for a <a class="xref" href="../../../../../api/Hi.Milling.MillingTools.MillingTool.html">MillingTool</a> editing helper:</p>
<pre><code class="lang-csharp" name="MillingToolEditorDisplayee">using Hi.Common;
using Hi.Common.Messages;
using Hi.Disp;
using Hi.Disp.Flag;
using Hi.Geom;
using Hi.Mech.Topo;
using Hi.Milling.Cutters;
using Hi.NcMech.Holders;
using System;
using System.Collections.Generic;

namespace Hi.Milling.MillingTools
{
    /// &lt;summary&gt;
    /// Display host for a milling tool composed of a cutter and a holder.
    /// &lt;/summary&gt;
    public class MillingToolEditorDisplayee : ITopoDisplayee, IClearCache
    {
        /// &lt;summary&gt;
        /// Gets or sets the delegate that provides the &lt;see cref=&quot;MillingTool&quot;/&gt; instance.
        /// &lt;/summary&gt;
        public Func&lt;MillingTool&gt; MillingToolGetter { get; set; }
        /// &lt;summary&gt;
        /// Gets the current &lt;see cref=&quot;MillingTool&quot;/&gt; instance.
        /// &lt;/summary&gt;
        public MillingTool MillingTool =&gt; MillingToolGetter?.Invoke();

        /// &lt;summary&gt;
        /// Gets or sets whether to show the cutter.
        /// &lt;/summary&gt;
        public bool ShowCutter { get; set; } = true;
        /// &lt;summary&gt;
        /// Gets or sets whether to show the holder.
        /// &lt;/summary&gt;
        public bool ShowHolder { get; set; } = true;

        /// &lt;summary&gt;
        /// Gets the displayee for the milling cutter.
        /// &lt;/summary&gt;
        public MillingCutterEditorDisplayee MillingCutterEditorDisplayee { get; }
            = new MillingCutterEditorDisplayee();
        /// &lt;summary&gt;
        /// Gets the displayee for the holder.
        /// &lt;/summary&gt;
        public HolderEditorDisplayee HolderEditorDisplayee { get; }
            = new HolderEditorDisplayee();
        /// &lt;inheritdoc/&gt;
        public List&lt;IAnchoredDisplayee&gt; GetAnchoredDisplayeeList()
        {
            var dst = new List&lt;IAnchoredDisplayee&gt;();

            var millingTool = MillingTool;
            if (millingTool == null)
                return dst;

            if (ShowCutter)
            {
                var cutter = millingTool.Cutter;
                if (cutter is MillingCutter millingCutter)
                {
                    //MessageKit.AddMessage($&quot;MillingTool.Cutter: {MillingTool?.Cutter?.GetHashCode()}&quot;);
                    MillingCutterEditorDisplayee.MillingCutterSourceFunc
                        = () =&gt; MillingTool?.Cutter as MillingCutter;
                    dst.Add(MillingCutterEditorDisplayee);
                }
                else if(cutter!=null)
                    dst.Add(cutter);
            }
            if (ShowHolder)
            {
                HolderEditorDisplayee.Holder = millingTool.Holder;
                dst.Add(HolderEditorDisplayee);
            }
            return dst;
        }
        /// &lt;inheritdoc/&gt;
        public void Display(Bind bind)
        {
            bind.PushCoveringPixelMode();
            DimensionBar.Display(bind, &quot;mm&quot;);
            bind.ModelMatStack.Pop();

            TopoDisplayeeUtil.Display(this, bind);
        }
        /// &lt;inheritdoc/&gt;
        public void ExpandToBox3d(Box3d dst)
        {
            TopoDisplayeeUtil.ExpandToBox3d(this, dst);
        }
        /// &lt;inheritdoc/&gt;
        public Asmb GetAsmb() =&gt; MillingTool?.Asmb;
        /// &lt;inheritdoc/&gt;
        public Anchor GetAnchor() =&gt; MillingTool?.GetAnchor();
        /// &lt;inheritdoc/&gt;
        public void ClearCache()
        {
            MillingCutterEditorDisplayee?.ClearCache();
        }
    }
}
</code></pre>
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